Dementia Stage Guide

The Functional Assessment Staging Test (FAST) is a clinical tool developed by Barry Reisberg, MD at NYU Langone Health. It describes dementia progression through 7 stages (with sub-stages at stages 6 and 7), based on observable functional abilities rather than cognitive test scores. FAST is widely used by physicians, geriatric care managers, and hospice professionals to assess dementia severity and guide care planning. Unlike the CDR or MMSE, FAST focuses on what a person can and cannot do — making it accessible for families.

The FAST scale has 7 stages: Stage 1 (normal aging), Stage 2 (subjective memory complaints), Stage 3 (mild cognitive impairment — noticeable to others), Stage 4 (mild dementia — difficulty with finances, planning), Stage 5 (moderate dementia — needs help choosing clothing), Stage 6 (moderately severe — needs help with dressing, bathing, toileting; incontinence develops across 6a–6e), and Stage 7 (severe — speech loss, mobility loss, loss of basic physical function across 7a–7f).

The Global Deterioration Scale (GDS) and the FAST scale were both developed by Dr. Barry Reisberg and align closely — GDS Stage 1 corresponds to FAST Stage 1, and so on. The GDS uses cognitive language ('forgets names of family members') while FAST uses functional language ('cannot bathe without assistance'). Both are valid for staging, but FAST is often preferred in care-planning settings because it describes what care tasks are needed rather than what the person can't remember.

Stage duration varies enormously between individuals. Alzheimer's disease (the most common cause of dementia) typically progresses from Stage 1 to Stage 7 over 8–10 years total, but this ranges from 3 to 20+ years. Early stages (1–3) may each last several years; Stage 4 typically lasts about 2 years; Stage 5 about 1.5 years; Stage 6 about 2–3 years; Stage 7 may last 1–2 years. Vascular dementia and Lewy body dementia may progress more rapidly or erratically.

Memory care communities are typically appropriate from FAST Stage 5 onward, when a person needs daily supervision and assistance with personal care. By Stage 6, dedicated memory care becomes strongly recommended because the person requires hands-on assistance with dressing, bathing, and toileting, along with a secure environment to prevent wandering. Some assisted living communities have memory care wings that can accommodate Stage 5–6 residents; Stage 7 typically requires skilled nursing or hospice-level care.

Medicare covers hospice when a physician certifies that the patient's life expectancy is 6 months or less if the disease follows its expected course. For dementia, Medicare uses the FAST scale as its guideline: a patient at FAST Stage 7c or beyond (non-ambulatory) who also has one or more additional condition such as aspiration pneumonia, UTI, septicemia, multiple decubitus ulcers, or 10% weight loss in 6 months is considered to meet hospice criteria. The hospice physician and attending physician must both certify eligibility.

Yes — dementia does not always progress at a steady rate. Periods of plateau are common, particularly in early stages. Certain interventions (treating underlying conditions like UTIs, depression, thyroid disorders, or medication side effects) can lead to apparent improvement. However, the underlying neurodegeneration of Alzheimer's and similar diseases is ultimately progressive. What appears to be a plateau is often slower progression rather than true arrest.